Hello! I have a question of how to build correct labview structure. I have a path control in my main vi and want to check if it is correct in a sub vi. If not correct, ask the user for a correct one in the sub vi. I see two different options of how to do it and I think no one is realy good. 1. Draw a wire from the path control to the input of the subvi. The answer from the sub vi is connected to a local of the path control. This uses locals that I should not use. 2. Draw a reference from the path control to the input of the sub vi. In the sub vi change the value of the reference if path is not correct. No output is needed. Using reference you do not see where variables changes. How should I solve a problem like this? Please help me! TJ